package com.kk.blog.util;


import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Utils {

    /*
        MD5加密类
    *   @param str要加密的字符串
    *   @return加密后的字符串
    */
    public static String code(String str){
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(str.getBytes());
            byte[] byteDigest = md.digest();int i;
            StringBuffer buf = new StringBuffer("");
            for (int offset = 0; offset< byteDigest.length; offset++){
                i = byteDigest[offset];
                if (i<0)
                    i= 256;
                if(i<16)
                    buf.append("0");
                buf.append(Integer.toHexString(i));
            }
            //32位加密
            return buf.toString();
            //16位的加密
            //return buf.toString().substring(8,24);
        }catch (NoSuchAlgorithmException e){
            e.printStackTrace();
            return null;
        }

    }

    public static void main(String[] args) {
        System.out.println(code("123"));
    }

}
